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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78aacdd69384aad8675ebd3e82735eedd492efed4fa30314c3a971c08d747953' 
  AND token = '1g4GnupaiRnmhziCZakv4szMkSlsFs1U1m9sGdkjmJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}